Š Suppose (X; Y;Z) is a random vector with joint probability density function 3 xyz2 0<x< 1,0<y<2,0<z4 fx,y,z(x,y,z)= 0 else 1. Find E(2X + Y + Z). 2. Let W=Y?, Find f wlw) 3. P(Y<0.71Z>1